Leases - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Business Acquisition [Line Items] | ||||||
| Sublease, remaining lease term (less than) | 2 years | |||||
| Rent expense | $ 1.6 | $ 1.2 | $ 3.3 | $ 2.5 | ||
| DiscoverOrg Holdings | ||||||
| Business Acquisition [Line Items] | ||||||
| Operating lease, remaining lease term | 11 years | |||||
| Operating lease, option to extend lease, term | 5 years | |||||
| Rent expense | $ 6.5 | $ 1.9 | ||||
| DiscoverOrg Holdings | Minimum | ||||||
| Business Acquisition [Line Items] | ||||||
| Sublease, remaining lease term (less than) | 1 year | |||||
| DiscoverOrg Holdings | Maximum | ||||||
| Business Acquisition [Line Items] | ||||||
| Sublease, remaining lease term (less than) | 6 years | |||||